package service;
/**
* @author	gem
*/
import java.util.*;

import po.Book;
import po.Comment;
import po.User;

public interface UserService {
	public boolean addUser(User newUser);
	public boolean loginIn(String userId,String password);
	public boolean updateUserInformation(User newUserInfo);
	public boolean existUser(String userId);
	public List<User> getUserById(String userId);
	public List<User> getUserByName(String username);
	
}
